Vulcanizing valve



Jan. 16, 1923. 1,442,226.

. H. P. KRAFT.

VULGANIZING VALVE. FILED ozc.17.1914.

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INVENTOR WITNESSES: 6%, M4

flrw w By Attomeys Patented Jan. 16, 1923.

HENRY P. KRAFT, OF RIDGEWOOD, NEW JERSEY.

VULCANIZING VALVE.

Application filed December 17,1914. Serial No. 877,788.

T 0 all whom it may concern:

Be it known that I, HENRY P. KRAFT, a citizen of the United States ofAmerica, residing in Ridgewood, in the county of Bergen and State of NewJersey, have invented certain new and useful Improvements in VulcanizingValves, of which the following is a specification.

This invention relates to valves for use in connection with thevulcanizing of rubber tires or like devices, and aims to provide certainimprovements therein.

In the vulcanizing of tires and tire tubes it is customary to inflatethe tire or tube with air and inject at the same time a cer tainquantity of water which is vaporized during the vulcanizing process.Trouble has been experienced in the provision of a Valve which willstand the pressure involved and at the same time will not deterioraterapidly under the heat of vulcanizing. It has been customary to use ametal valve having a metallic seat, and while such valves are efficientfor a short time the repeated screwing and unscrewing of the valve uponits seat soon destroys the meeting surfaces, and leakage occurs.

The object of the present invention is to provide a valve of thischaracter in which a soft metal or fiber packing is used, means beingprovided for quickly substituting a new packing as frequently asdesired.

The drawing illustrating the invention shows in diametrical section,partly in elevation, an embodiment of the invention which has provenhighly successful in practice.

In the drawings, let A indicate the'valve casing or stem, the lower partof which is usually secured to the tire or tube by means of a rubber cotmoulded on the latter. The upper part is provided with a valve seat Band beyond the valve seat a screw-threaded portion G into which thevalve cap D is screwed.

The valve cap D which constitutes the valve proper is provided with ascrewthreaded portion F adapted to coact with the screw-thread C to movethe cap downwardly or upwardly. The valve is provided with a bore Gwhich, however, does not extend entirely through the valve, the latterbeing provided with an imperforate portion H, and the bore beingconnected with the exterior by suitable imperforate portion is carried avalve Flirts I. Beneath the packing or .washer J which isadapted to makeconnection with the seatB.

The valve packing J may be of lead, or suitable heat resisting fiber, orother material" but in any event requires frequent replacement dueeither to wear or to deterioration on account of the heat. I hence holdthe packin in place by a screw-threaded cap or sleeve which has acentral opening of suflicient size to enable the seat B to pass throughit, and a flange L underlying the edge of the packing washer and servingto hold the latter in place. When the packing becomes defective orinjured, it is necessary only to screw out the member D, unscrew thesleeve K, and replace in which the packing washer is raised slightlyabove the seat B. Fluid under pressure will hence flow through the valveand easing until suflicient pressure has been reached in the tire,whereupon a turn or less of the valve D will be sufficient to seat thewasher and close the valve. The pipe line is of suflicient flexibilityto permit this turning movement. The coupling is then removed,

and the tire is placed in a vulcanizing oven,

and after the vulcanization the valve is opened or removed and the tireemptied of its fluid.

By the present invention various advantages are accomplished. Ascompared with an all-metal valve, the construction is less expensive andgreatly more durable. There is practically no wear on the valve casingor shell, and none on the valve proper, ex-

cept at the packing which can be easily replaced.

While I have shown and described a certain embodiment of the invention,it is understood that I do not wish to be limited thereto, since variouschanges can be made there'- in without departing from the spirit of theinvention.

WVhat I claimlis A vulcanizing valve'comprising in combination a shellwhich is threaded interiorly at one end and is provided at its other.end with means for attaching a tube, the shell being further providedwith a passage extending through the last-mentioned endand terminatingin a valve seat, the engaging face of which is spaced from the adjacentportion of the shell body, a valve member having a centraleXteriorly-threaded portion for engagement with the threaded part of theshell, an interiorly-threaded outer end which acts as a coupling, and aclosed inner end which is of reduced diameter as compared with thethreaded central portion of the valve member, the latter having acentral bore terminating in lateral passages adjaccnt to said closedinner end, a packing located against the inner end of the valve memberand adapted to engage said seat, the packing extending laterally beyondthe seat, and a cap having threaded engagement with the inner end of thevalve memher and provided with a flange engaging over said packing, theflange portion of the cap being located around the valve seat when thevalve is closed and occupying a posi tion between the seat and theadjacent portion of the shell body, said cap being of less diameter thanthe threaded opening in the shell to permit removal of the valve memberwith the packing and cap attached,

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

HENRY P. KRAFT.

lVitnesses E. V. MYERS, FRED lVHrrE.

